Press-mold.



H. A. wtCKHAt/t.

PRESS MOLD. APPLICATION FILED OCT. I. I9I4.

1,239,652. Petented Sept. 11,191?.

J SI 5j mari sans c. HENRY ALEXANDER WICKHAM, or LONDON, ENGLAND.'

l Y PRESS-Morin.,

, 1t2399652, Specification of Letters Patent. fpgmngd @met il, 119217, Application led October 1, 1914;. Serial No. 864,423.

To all 'whom t may concern.' are clamped together by means of nuts and Be it known that I, HENRY ALEXANDER bolts indicated at H. The lower extremity WICKHAM, a subject of the King of Engof each of the sections A is flanged at E to land,- residing in London, England, have provide a supporting ledge for a removable 5 invented certain new and useful Improvebottom plate D. Each of the sections A is 60 .ments in Press-Molds, of which the folprovided with segmental flanges C in which lowing is a specification. -A

his invention relates to improvements longitudinal bolts R.

in press-molds which are. particularly ap- After the mold has been assembled as plicable for molding or compressing various shown in the drawings, the material is 465 su stances, such as tobacco and rubber. c arged into it and a plate T is placed moved toward and into the mold to apply another plate G and the apparatus 1s placed 70 the working face of the piston-device to ciently to allow the plate G preferably to 75 accommodate any alteration in the bulk of enter within the top of the mold.. Crossthe contents'of the mold (for example to bars R1 are then swung across over the uptake up for any slack occurring therein). per surface of the plate G and are secured Preferably the mold is built up of two or in place by means of nuts R2.

more independent sections secured together. lt will be seen therefore that in the case, 80

feature of the invention consists in for instance, of tobacco or rubber which may forming the walls of the molds with pro'- be'the material undergoing treatment, it is jections to accommodate bolts or the like, compressed within the mold to a predeterto whic are secured cross-bars, cleats or mined required degree and any moisture eX- the like, adapted to engage with the pistonpressed therefrom may pass out through the 85 device after it has been inserted within the interstices at the various joints of the appamold and to hold it in its adjusted position. ratus, and between the edges of the plates ther features of the invention will be T- and G andthe inner walls of the mold,- more clearly understood by reference to the and any slack which would otherwise occur following description taken in connection by 'shrinkage of the contents of the mold 90 contact with the upper layer of the contents igure l is a central sectional elevation of the mold and thereby maintain, during 40 taken on the line 1-l of Fig. 2; the entire treatment in the mold, the re- 95 Fi 2 is a section on the line 2-2 of quired pressure upon the material.. Fig. The constructional form of press em- Fig. 3 is a detail of a portion of the apployed for initially forcing the plates T and paratus partly in section, and G and the springs S on to the contents of the ig. 4 is a similar view to Fig. l 'of the mold, is immaterial to the present invention 100 I upper portion of the apparatus after the and may be either ai mechanical, hydraulic piston-device has been forced into the mold or other convenient construction. Moreover, and clamped in position. the particular configuration of the mold v Like letters indicate like parts throughmay be modied according to the present inout the drawings. vention to any desired form and although it 105 The mold or box is Composed of four 'has been illustrated as of square section, the

' similar sections `A, one of which isl shown l invention is not in any way limited thereto. in sectional plan in Fig. 3, having eXtremi- Further, instead of the coiled springs beties A1 which provide meeting surfaces at tween the plates T and G, any other suitable the angles of the mold whereby the sections means which will bring about the saine ef- M0 feet, that is the eiect of taking up for any slack occurring in the material or for allowing for any expansion in the bulk thereof, may be employed. Also, in place of the cross-bars R1, cleats or any other convenient form of holding device to retain the plate G in place, may be utilized.

It will therefore be seen that with the apparatus above described the main object of the present invention is adequately attained, that isto say, a mold is providedof which the contents may be placed under pressure, which pressure is maintained during the whole of the time that the material in the mold is undergoing treatment (for example curing) irrespective of alterations which may occur in the bulk of the material.

What I claim as my invention and desire to secure by Letters Patent is 1. An open top mold having side walls and a bottom7 a resilient pressure 'device having two members for compressing the material within the mold, springs interposed between the inner and outer members, and a screw clamping device on the mold for retaining the outer member in position relative to the mold after it has been moved a predetermined distance with relation thereto, the arrangement being such that the springs will move the inner member within the mold to follow up the material therein as it shrinks under the pressure of the springs; substantially as described.

2. A device of the character described for molding material which will shrink within' the mold after the initial pressure is applied thereto, comprising a mold, a composite piston, said piston having two plates movable relative to each other, means for securing the outer plate to the mold section after the second plate has been pressed to a predetermined point within the mold, and springs interposed between said plates and arranged to move the inner plate of the piston relative to the outer plate to follow up and maintain the material under pressure while shrinking within the mold; substantially as described.

3. An open top mold having side walls and a bottom, a resilient pressure device having two members for compressing the material within the mold, the inner member being arranged to engage the side walls of the mold to be guided thereby, springs interposed between theinner and outer members, and an adjustable clamping device 0n the mold for retaining the outer member in position relative to the mold after it has been moved a predetermined distance with relation thereto, the arrangement being such that the springs will move the inner member Within the mold to follow up the material therein as it shrinks under the pressure of the springs; substantially as described.

4. A device or' the character described for molding material which will shrink Within the mold after the initial pressure is applied thereto, comprising a plurality of sections -each having a mold-forming portion and end ianges, means for securing said sections together, a composite piston, said piston having two members movable relatively to each other, means for securing the outer member to the said mold-forming sections after the piston has been pressed to a predetermined point with relation to the mold, and springs interposed between the said members and arranged to move the inner member of the piston relatively to the outer members to follow up and maintain the ma- Y terial under pressure while shrinking within the mold, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HENRY ALEXANDER WICKHAM.

Witnessses LESLIE GEORGE EvEs, haar B. BRIDGE. l 

